JP2000240426A - Manufacture of silencing layer in muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniform the density of a silencing layer and improve the silencing performance by loosening a bundled material consisting of a bundle of a number of glass fibers into bulky form, and winding the resulting fiber bundle on the outer circumference of a perforated pipe constituting a muffler to form a silencing layer. SOLUTION: A bundled material 1 is formed of a bundle of about 2000 long- fiber glass fibers 1a with, for example, each fiber diameter of 13-24 μm, and such a bundled material 1 is loosened into single fiber bulky form or glass wool form. The resulting fiber bundle 2 is stocked in a stocker 3, and the stocked fiber bundle 2 is drawn out and wound on the outer circumferential surface of a perforated pipe, for example, an inner pipe 4 having small pores 5... formed thereon. Thereafter, the inner pipe 4 is inserted to an outer pipe 13 having an end plate 12 having an inner pipe insert hole 11 from the other end-side opening, and the outer end-side opening is blocked by an end plate 14 to complete a muffler 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a muffling layer in a muffler.

[0002]

2. Description of the Related Art Conventionally, the exhaust system of an internal combustion engine of an automobile has
A prima muffler or a sub muffler is arranged on the upstream side.

Conventionally, as shown in FIG. 3, an injection hole 102 is formed in an end plate 101 of a case 100 constituting the muffler, and a long fiber glass fiber 103 is formed from the injection hole 102 as shown in FIG. Space 105 between bright pipe (inner pipe) 104 and case 100
There is known a silencer in which a silencer is formed by randomly injecting the glass fiber into a silencing layer.

[0004]

In the conventional method of injecting the glass fiber 103 as described above, the filling amount of the glass fiber 103 is insufficient, or the filling amount in the entire space varies, and the filling density is reduced. Become uneven,
There is a problem that the silencing performance is reduced.

[0005] Accordingly, the present invention provides a method for manufacturing a noise reduction layer in a noise reduction device in which a noise reduction layer is formed using glass fiber, in which the density of the noise reduction layer is equalized and the noise reduction performance is improved. It is intended for.

[0006]

According to a first aspect of the present invention, in order to solve the above-mentioned problems, a bundle material in which a large number of glass fibers are bundled with a binder is defibrated into a bulky shape. The defibrated fiber bundle is wound around the perforated pipe constituting the muffler to form a muffling layer.

According to a second aspect of the present invention, in the first aspect, the defibrating method includes supplying the sizing material into a nozzle and blowing compressed air into the nozzle. The fiber bundle is loosened to produce a fiber bundle continuously defibrated from the nozzle.

According to a third aspect of the present invention, in the first or second aspect, as the method of winding the defibrated fiber bundle around an outer periphery of a perforated pipe, a perforated pipe is used. ,
The fiber bundle is supplied while rotating about the axis.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a method of winding the defibrated fiber bundle around an outer periphery of a perforated pipe is provided. The fiber bundle is supplied to a perforated pipe while applying tension by a tension roller while rotating the pipe around its axis.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on the embodiment shown in FIGS. FIG. 1 shows the manufacturing process.

FIG. 1 (a) shows a sizing material in which glass fibers to be used are bonded and bound with a predetermined sizing agent. The sizing material 1 is, for example, a bundle of about 2,000 long glass fibers 1a having a fiber diameter of 13 μm to 24 μm. The fiber diameter of the glass fiber 1a is not limited to the above-mentioned diameter, but may be smaller or larger. Also, the number of bundles is 1000 or 400
It is set to a required amount such as zero.

Next, as shown in FIG. 1 (b), the above-mentioned sizing material 1 is defibrated (unraveled) to form a single fiber and a bulky (bulky) shape. That is, the glass wool is formed.
As this defibration method, for example, the above-mentioned sizing material 1 is supplied into a nozzle, compressed air is blown into the nozzle, and the sizing material 1 is loosened into a single fiber with the compressed air and continuously sent out from the nozzle. Thus, the fiber bundles 2 which are defibrated in a bulky shape are continuously produced.

Next, the fiber bundle 2 is stocked in a stocker 3 as shown in FIG. At this time, one bundle of fiber bundles 2 is stocked to some extent in a defibrated state.

Next, the fiber bundles 2 stocked in the stocker 3 are pulled out of the stocker 3 and FIG.
As shown in (d), it is wound around a perforated pipe constituting the silencer, for example, the outer peripheral surface of the inner pipe 4. A small hole 5 is formed in the inner pipe 4, and the fiber bundle 2 is wound around the area where the small hole 5 is formed. As a method of winding, the fiber bundle 2 is reciprocated in the axial direction of the inner pipe 4 by a traverse mechanism or the like while the inner pipe 4 is being rotated about its axis by a suitable rotating means. The amount of winding is set as desired, and the single or multiple winding is performed according to the reciprocating amount of the fiber bundle 2 formed into one bundle.

The bundle may be wound with a single fiber bundle 2 as described above, but a plurality of bundles such as two bundles or three bundles may be wound simultaneously in consideration of productivity. FIG. 1 (e) shows the state of being wound as described above. The winding forms a glass wool sound-absorbing layer 6 having bulky properties.

As a method for supplying the fiber bundle 2 in the stocker 3 to the inner pipe 4 as described above, the fiber bundle 2 is supplied from the stocker 3 by supply rollers 7 and 8 as shown in FIG. The drawn fiber bundle 2 is passed between the tension rollers 9 and 10 and the tip is supplied to the inner pipe 4 and wound. By providing the tension rollers 9 and 10 in this manner, the density and weight of the fiber bundle 2 wound around the inner pipe 4 can be adjusted by adjusting the tension of the tension rollers 9 and 10.

Incidentally, depending on the density required for the noise reduction layer 6, the tension rollers 9 and 10 as described above may not be used. That is, only the friction between the fiber bundle 2 and the member supplying the fiber bundle may be used.

After the silencing layer 6 is formed on the inner pipe 4 as shown in FIG. 1E, the inner pipe 4 has an inner pipe insertion hole 11 formed on one side as shown in FIG. 1F. The outer pipe 13 having the end plate 12 is inserted through the other end side opening. At this time, the outer diameter of the sound absorbing layer 6 is an outer diameter that fits into the inner surface of the outer pipe 13 at a time.

Then, as described above, the inner pipe 4 and the sound absorbing layer 6 are connected to the outer pipe 13 as shown in FIG.
After insertion into the other end plate 1 as shown in FIG.
4 is put on an outer pipe 13 to produce a silencer 15.

Although the above embodiment is an example in which the present invention is applied to an inner pipe, the present invention can also be applied to a case where the above-described sound deadening layer 6 is provided in a perforated portion of another perforated pipe, for example, an outlet pipe. The invention is applicable.

[0021]

As described above, according to the first aspect of the present invention, a bundle of a number of glass fibers bundled with a sizing agent is defibrated to form a bulky fiber bundle, which is formed into a hole. In order to form a sound absorbing layer by winding around the outer circumference of a bright pipe,
The density of the entire silencing layer can be equalized as compared with the above-described conventional type in which the glass fiber is filled in the space of the silencer. Therefore, the silencing performance is improved.

According to the second aspect of the present invention, the defibration can be easily and continuously performed. According to the third aspect of the invention, the fiber bundle can be easily wound around the perforated pipe.

According to the fourth aspect of the present invention, the density of the sound absorbing layer to be formed can be easily adjusted by adjusting the tension at the time of supplying the fiber bundle.

[Brief description of the drawings]

FIG. 1 shows a production method of the present invention, wherein (a) to
(G) shows each step.

FIG. 2 shows an example of a process of supplying a fiber bundle to a perforated pipe in the production process of the present invention.

FIG. 3 is a diagram showing an example of a conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bundle material 1a Glass fiber 2 Fiber bundle 4 Stocker 5 Hole 6 Perforated pipe 9,10 Tension roller

Claims (4)

[Claims] A bunched material obtained by bundling a number of glass fibers with a sizing agent is defibrated into a bulky shape, and the defibrated fiber bundle is wound around an outer perforated pipe constituting a silencer. A method for producing a sound deadening layer in a sound deadening device, wherein the sound deadening layer is formed by heating. 2. The method of defibrating, wherein the bundled material is supplied into a nozzle, compressed air is blown into the nozzle, and the bundled material is loosened by the compressed air and the fibers are continuously fibrillated from the nozzle. Claim 1 wherein a bundle is made.
A method for producing a muffling layer in the muffler according to the above. 3. A method for winding the defibrated fiber bundle around the perforated pipe, wherein the perforated pipe is supplied while rotating the perforated pipe around its axis. A method for manufacturing a sound deadening layer in the sound deadening device according to claim 1. 4. A method for winding the defibrated fiber bundle around the perimeter of a perforated pipe, wherein the perforated pipe is rotated by a tension roller while rotating the perforated pipe around its axis. The method for producing a sound deadening layer in a sound deadening device according to any one of claims 1 to 3, wherein the sound deadening layer is supplied to a perforated pipe while imparting water.